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Acquisition (Narrative) (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 Barges Boats | Jul. 22, 2013 Barges Tug_Boats
Business Acquisition [Line Items] |  |
Business Acquisition, Transaction Costs |  | $ 230,900,000
Business Acquisition, Barges Acquired |  | 9
Business Acquisition, Tug Boats Acquired |  | 9
NumberOfBarges | 54 |
NumberOfBoats | 23 |
Property, Plant and Equipment, Estimated Useful Lives | 25 |
Amended Facility [Member] |  |
Business Acquisition [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 1,000,000,000 |

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